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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a78186af7c080ab1550a8129f6a693a28801ca5a874da9db79a72246f69d8817' 
  AND token = 'Fiz/k1xRavasgWSm5mqzTrcRkdQ3zmnW3qdmPCDyMB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}